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arXiv 2102.11291astro-ph.SR
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NGC 300中的AT 2019 qyl:共生双星中非常快的新星早期流出的内部碰撞

AT 2019qyl in NGC 300: Internal Collisions in the Early Outflow from a Very Fast Nova in a Symbiotic Binary

Jacob E. Jencson, Jennifer E. Andrews, Howard E. Bond, Viraj Karambelkar, David J. Sand, Schuyler D. van Dyk, Nadejda Blagorodnova, Martha L. Boyer, Mansi M. Ka… 展开作者

Jacob E. Jencson, Jennifer E. Andrews, Howard E. Bond, Viraj Karambelkar, David J. Sand, Schuyler D. van Dyk, Nadejda Blagorodnova, Martha L. Boyer, Mansi M. Kasliwal, Ryan M. Lau, Shazrene Mohamed, Robert Williams, Patricia A. Whitelock, Rachael C. Amaro, K. Azalee Bostroem, Yize Dong, Michael J. Lundquist, Stefano Valenti, Samuel D. Wyatt, Jamie Burke, Kishalay De, Saurabh W. Jha, Joel Johansson, César Rojas-Bravo, David A. Coulter, Ryan J. Foley, Robert D. Gehrz, Joshua Haislip, Daichi Hiramatsu, D. Andrew Howell, Charles D. Kilpatrick, Frank J. Masci, Curtis McCully, Chow-Choong Ngeow, Yen-Chen Pan, Craig Pellegrino, Anthony L. Piro, Vladimir Kouprianov, Daniel E. Reichart, Armin Rest, Sofia Rest, Nathan Smith

摘要:

新星爆发,即白矮星(WD)表面的热核爆炸,现在被认为是最常见的冲击动力天体物理瞬变现象之一。我们介绍了AT 2019 qyl的早期发现和快速的紫外(UV),光学和红外(IR)时间发展,AT 2019 qyl是附近的玉夫座星系NGC 300中的一颗新星。光变曲线显示出持续$\lesssim 1$天的快速上升,达到$M_V = -9.2$等的绝对峰值,以及非常快速的下降,在3.5天内衰减2等。光变曲线在71天后的急剧下降和快速下降的时间尺度表明,从一个大规模的WD与$M_{\rm WD} \gtrsim 1.2~M_{\odot}$低质量的喷射。我们提出了一个前所未有的看法,这样的事件的早期光谱演化。三个光谱前的峰值揭示了一个复杂的,多组分流出引起内部碰撞和冲击的喷出物的He/N-类新星。我们确定了一个一致的IR变量对应的广泛preeruption覆盖的瞬态位置,并推断存在一个共生的祖系统与O-丰富的渐近巨星分支捐助星,以及在2014年早期的紫外线明亮的爆发的证据。我们认为,AT 2019 qyl类似于银河系复发新星的子集,有红巨星伴星,如RS Oph和其他嵌入的新星系统,如V407 Cyg。我们的观察提供了新的证据,多个,不同的外流组件之间的内部冲击可能有助于从这样的系统产生的冲击动力发射。

英文摘要:

Nova eruptions, thermonuclear explosions on the surfaces of white dwarfs (WDs), are now recognized to be among the most common shock-powered astrophysical transients. We present the early discovery and rapid ultraviolet (UV), optical, and infrared (IR) temporal development of AT 2019qyl, a recent nova in the nearby Sculptor Group galaxy NGC 300. The light curve shows a rapid rise lasting $\lesssim 1$ day, reaching a peak absolute magnitude of $M_V = -9.2$ mag, and a very fast decline, fading by 2 mag over 3.5 days. A steep dropoff in the light curves after 71 days and the rapid decline timescale suggest a low-mass ejection from a massive WD with $M_{\rm WD} \gtrsim 1.2~M_{\odot}$. We present an unprecedented view of the early spectroscopic evolution of such an event. Three spectra prior to the peak reveal a complex, multicomponent outflow giving rise to internal collisions and shocks in the ejecta of an He/N-class nova. We identify a coincident IR-variable counterpart in the extensive preeruption coverage of the transient location and infer the presence of a symbiotic progenitor system with an O-rich asymptotic-giant-branch donor star, as well as evidence for an earlier UV-bright outburst in 2014. We suggest that AT 2019qyl is analogous to the subset of Galactic recurrent novae with red-giant companions such as RS Oph and other embedded nova systems like V407 Cyg. Our observations provide new evidence that internal shocks between multiple, distinct outflow components likely contribute to the generation of the shock-powered emission from such systems.

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